Morrow was hired in 1930 by Joseph Strauss to design the Golden Gate Bridge. Morrow collaborated with Strauss with the design, sketching his ideas in charcoal. Morrow romanticized the bridge long before he was hired to work on it, writing in 1919 that "The narrow strait is caressed by breezes from the blue bay throughout the long golden afternoon, but perhaps it is loveliest at the cool end of the day when, for a few breathless moments, faint afterglows transfigure the gray line of hills."[2]

It was also Morrow that decided the bridge should be painted international orange. At first, Morrow's suggestion was deemed by the bridge authorities as ludicrous, as it was thought no paint could withstand the salty weather. Morrow found such a paint, and the bridge authorities relented.